Persistence
Despite having been imprisoned in the Glade for two years, the Gladers have not given up on trying to solve the Maze. Not trying to solve it would mean giving up and succumbing to a sense of hopelessness. Though the task may come to feel pointless, they continue to persevere.
Thomas is able to tap into this spirit when he begins to emerge as a leader. He does this primarily by demonstrating persistence and perseverance when he is trapped in the Maze with Minho and Alby. By not giving up or accepting the traditional viewpoint that a night in the Maze means certain death, Thomas is able to form a plan to keep himself and the other two boys alive. He emerges as a hero who has bucked the trend and given hope to a beleaguered community.